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;14 113 /flu • r._- Howarc R. Green Con oany CONSULTING ENGINEERS January 17, 2001 File: 811751J-0240 Ms. Michele McPherson Director of Planning City of Elk River 13065 Orono Parkway P.O. Box 490 Elk River, MN 55330-0490 RE: ELK RIVER MUFFLER AND BRAKE EXPANSION Dear Ms. McPherson: As requested, we have reviewed the plans prepared by John Oliver and Associates for the expansion of the Elk River Muffler and Brake facility located on 171st Avenue at • Ulysses Street. Based upon our review, we would offer the following comments: 1. The grading, drainage, and erosion control plan is essentially the plan from the first construction. It does not show any detail for the future expansion relative to the parking area or other site improvements. A revised plan which shows the detail on the proposed expansion should be submitted, reviewed, and approved. 2. The retention pond is construction with 3:1 side slopes. Therefore, according to City policy, it must be fenced. The proposed fencing is shown attaching to the proposed expansion. There must be an access point provided for the fire lane required by the Fire Chief. 3. There is not sufficient room on the site for the proposed expansion, the 20-foot fire lane, and the ponding. Currently, the 20-foot fire lane is at least five to seven feet down the 3:1 slope of the pond. We would suggest that the building expansion be shortened by ten feet to allow sufficient room for all of these items. 4. The top of the pond should be lowered by approximately half a foot at the area of the emergency overflow. Currently, the top of the pond dike is at 877.0 all along the top. By lowering it to 876.5 at the emergency overflow, it can be predicted where the overflow will occur. 5. It is unclear where the dumpster for the building will be placed after the expansion. • O:\PROJ\811751j\0240\Ltr 01-17-01 McPherson.doc 1326 Energy Park Drive • St. Paul, MN 55108 • 651/644-4389 fax 651/644-9446 toll free 888/368-4389